In this quote from Lewis Carroll's "Alice in Wonderland," the speaker expresses unfamiliarity with a certain phrase or idea, indicating they haven't heard it before. They describe the concept as "uncommon nonsense," implying it seems strange or illogical to them. This reflects the whimsical and nonsensical tone often found throughout the book, where characters frequently encounter bizarre or confusing situations.

"Well, I never heard it before, but it sounds uncommon nonsense," showcases the playful language and curious mindset of Wonderland's inhabitants. The quote underscores the theme of unfamiliarity and the humorous skepticism characters have towards strange or new ideas encountered in their surreal world.